Warning!
DO NOT EVER INSTALL FIRMWARE UPGRADES FOR Samsung SmartTV !!!! BY UPGRADING YOU WILL ONLY LOSE EXISTING FEATURES AND TURN YOUR TV INTO DUMBTV!!!
REMEMBER TO DISABLE AUTOMATIC UPDATES on TV (OTN Support) and on router by blocking IP 157.55.184.57 on all ports!!!!

>1443.0
Removed Feature(temporary) -Clone TV and Second TV with Smart View 2.0 disabled
All 2015 JU and JS TV's(with quantum dots matrix) got updated to support HDR metadata and HDMI 2.0a. It was introduced in firmware 1443, so if you have that or later you've got HDR support.

Developer mode is available
Finally, you are able to try to install your application on Samsung Tizen TV. You can add your TV device into Tizen SDK IDE, run application on it. Currently, developer mode for tizen application is only available for specific models of '15 now. Samsung plans to expand it to other models by OTN. Expected Schedule will be updated later.

Yes 1411 is not yet available by OTN(over the network) but can be downloaded and upgraded using USB. Unfortunately Samsung doesn't share changelog but I updated in first post known resolved issues or added features.